HDMI: When TV reports standby, playback devices lose active source

Make sure PowerStatusMonitorActionFromPlayback re-uses the same logic
from onActiveSourceLost when TV consistently reports power off. This way
the user is visually notified in case they have a faulty CEC setup (e.g.
old TV panel) where they can easily disable the setting that sends their
playback device to sleep.

Bug: 390708778
Bug: 420516708
Test: atest com.android.server.hdmi
Flag: EXEMPT bugfix
Change-Id: Ib3209096e5913eb14c341d4bf14023377f86589d